The RPC_SECURITY_ATTRIBUTES structure represents security attributes that can be set through the Remote Procedure Call Protocol Extensions, as specified in [MS-CMRP] section 2.2.3.2.

 typedef struct _RPC_SECURITY_ATTRIBUTES {
   DWORD nLength;
   RPC_SECURITY_DESCRIPTOR RpcSecurityDescriptor;
   BOOLEAN bInheritHandle;
 } RPC_SECURITY_ATTRIBUTES,
  *PRPC_SECURITY_ATTRIBUTES;

nLength: The length in bytes of the security descriptor.

RpcSecurityDescriptor: The security descriptor that MUST be as specified in RPC_SECURITY_DESCRIPTOR.

bInheritHandle: TRUE if the new process inherits the handle; otherwise, FALSE.